Examine source code of Youtube - Block Shorts

{
  "manifest_version": 2,
  "name": "Block YouTube Shorts",
  "version": "1.0",
  "description": "Redirects /shorts URLs and hides Shorts shelves on YouTube.",
  "permissions": [
    "tabs",
    "webNavigation",
    "*://www.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content_script.js"
      ],
      "css": [
        "hide_shorts.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icons/youtube-block-shorts-48.png",
    "96": "icons/youtube-block-shorts-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bfa46f81-7263-4c46-8252-e7e646da152a}"
    }
  }
}